fix(matcher): allow whitespace as a matching suffix (#75)

Author: qwqcode

SubRenamer.Core/MatcherDiff.cs

@@ -76,14 +76,14 @@ private static string FindCommonSuffix(string a, string b)
 
         return "";
 
-        // Skip [a-z], [A-Z], [0-9], and whitespace. Which is not allowed as a suffix.
+        // Skip [a-z], [A-Z], [0-9]. Which is not allowed as a suffix.
         // Because it may be a part of the `Key` (Episode Number).
         // Such as "file [01A] end" and "file [01B] end".
         //
         // But allows Chinese character as a suffix.
         // Such as "file 01 話" and "file 02 話".
         // @see https://github.com/qwqcode/SubRenamer/pull/45
-        bool Skip(char c) => char.IsAsciiLetterOrDigit(c) || c == ' ';
+        bool Skip(char c) => char.IsAsciiLetterOrDigit(c);
     }
 
     public static string ExtractMatchKeyByDiff(DiffResult? diff, string filename)

SubRenamer.Tests/MatcherTests/FindCommonSuffixTests.cs

@@ -16,7 +16,7 @@ public void Basic()
     {
         Assert.That(FindCommonSuffix("01]", "02]"), Is.EqualTo("]"));
         Assert.That(FindCommonSuffix("01]end", "02]end"), Is.EqualTo("]"));
-        Assert.That(FindCommonSuffix(" 01 ] end", " 02 ] end"), Is.EqualTo("]"));
+        Assert.That(FindCommonSuffix(" 01 ] end", " 02 ] end"), Is.EqualTo(" "));
     }
 
     [Test]
@@ -30,15 +30,15 @@ public void SkipMatchCharacter()
         Assert.That(FindCommonSuffix("01a", "02a"), Is.EqualTo(""), "should skip Lowercase Letter, then no match");
         Assert.That(FindCommonSuffix("01a]", "02a]"), Is.EqualTo("]"), "should skip Lowercase Letter, then match");
 
-        Assert.That(FindCommonSuffix("01 ", "02  "), Is.EqualTo(""), "should skip Whitespace, then no match");
-        Assert.That(FindCommonSuffix("01 ]", "02  ]"), Is.EqualTo("]"), "should skip Whitespace, then match");
+        Assert.That(FindCommonSuffix("01 ", "02  "), Is.EqualTo(" "), "should not skip Whitespace, then match");
+        Assert.That(FindCommonSuffix("01 ]", "02  ]"), Is.EqualTo(" "), "should not skip Whitespace, then match");
     }
 
     [Test]
     public void NoCommon()
     {
         Assert.That(FindCommonSuffix("01$", "02]"), Is.EqualTo(""));
-        Assert.That(FindCommonSuffix("01 abc", "02 def"), Is.EqualTo(""));
+        Assert.That(FindCommonSuffix("01abc", "02def"), Is.EqualTo(""));
     }
 
     [Test]
@@ -65,9 +65,9 @@ public void MatchChineseCharacter()
     {
         // @see https://github.com/qwqcode/SubRenamer/pull/45
         Assert.That(FindCommonSuffix("01話", "02話"), Is.EqualTo("話"));
-        Assert.That(FindCommonSuffix("01B 集", "02B 集"), Is.EqualTo("集"));
+        Assert.That(FindCommonSuffix("01B 集", "02B 集"), Is.EqualTo(" "));
 
-        var result = FindCommonSuffix("01B 話 番外篇", "02B 話 番外篇");
+        var result = FindCommonSuffix("01B話 番外篇", "02B話 番外篇");
         Assert.That(result.Length, Is.EqualTo(1), "should match only single character");
         Assert.That(result, Is.EqualTo("話"));
     }

SubRenamer.Tests/MatcherTests/TopLevelTests.json

@@ -94,6 +94,19 @@
       {"Key": "10", "Video": "[Kamigami] Haikyuu!! S2 - 10 [1920x1080 HEVC AAC Sub(Chs,Cht,Jap)].mkv", "Subtitle": "[YYDM-11FANS][Haikyuu!!][10][BDRIP][720P][X264-10bit_AAC][6FDEFD72].tc.ass"}
     ]
   },
+  {
+    "Name": "轻音少女 (Whitespace as Suffix)",
+    "Input": [
+      {"Key": "", "Video": "轻音少女 S01E01 1080p.VCB-Studio.mkv", "Subtitle": ""},
+      {"Key": "", "Video": "轻音少女 S01E02 1080p.VCB-Studio.mkv", "Subtitle": ""},
+      {"Key": "", "Video": "", "Subtitle": "轻音少女S01E01.ass"},
+      {"Key": "", "Video": "", "Subtitle": "轻音少女S01E02.ass"}
+    ],
+    "Output": [
+      {"Key": "1", "Video": "轻音少女 S01E01 1080p.VCB-Studio.mkv", "Subtitle": "轻音少女S01E01.ass"},
+      {"Key": "2", "Video": "轻音少女 S01E02 1080p.VCB-Studio.mkv", "Subtitle": "轻音少女S01E02.ass"}
+    ]
+  },
   {
     "Name": "SquareBrackets",
     "Input": [
@@ -121,7 +134,7 @@
     ]
   },
   {
-    "Name": "WhiteSpaceEnd",
+    "Name": "WhiteSpaceAsSuffix",
     "Input": [
       {"Key": "", "Video": "视频 1 xyz.mov", "Subtitle": ""},
       {"Key": "", "Video": "视频 77 test xyz.mov", "Subtitle": ""},